JP2011122610A - Vacuum insulation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely maintain flatness while reducing heat transfer through a spacer. <P>SOLUTION: The vacuum insulation structure in which an internal space 19 formed between first and second metal plates 10A, 10B opposed to each other is evacuated includes: first and second reinforcing plates 21A, 21B which are disposed respectively on the opposed inner surface sides of the metal plates 10A, 10B, and are harder than the metal plates 10A, 10B; a number of spacers 23 which are disposed between the reinforcing plates 21A, 21B, and are lower in heat conductivity and harder than the metal plates 10A, 10B; and a positioning member 24 which is disposed between the reinforcing plates 21A, 21B, is lower in heat conductivity than the metal plates 10A, 10B, and has positioning portions 26 for positioning the spacers 23 at determined positions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating structure in which a closed internal space is evacuated.

  Heating furnaces and refrigerators are insulated from the outside air by laying a heat insulating material on their wall surfaces. Moreover, a heat insulating material is not restricted to a heating furnace or a refrigerator, It is used also for the metal mold | die of a rubber molded product or a resin molded product.

  Specifically, as shown in FIG. 15, the rubber mold or the resin mold has an upper frame 2 disposed on the upper part of the machine body 1 extending in the vertical direction and a lower frame 3 disposed on the lower part. Yes. Among them, the upper mold 4 is fixed to the upper frame 2, and the lower mold 5 is fixed to the lower frame 3. Further, the lower frame 3 is configured to be movable in the vertical direction by a cylinder 6 that is a driving means. These upper and lower molds 4 and 5 are fixed to the frames 2 and 3 via mounting plates 7A and 7B. In addition, the upper and lower molds 4 and 5 are provided with heating plates 8A and 8B with built-in heaters as heating means on the mounting plates 7A and 7B in order to maintain a predetermined temperature during molding. The mold is provided with heat insulating materials 9A, 9B between the heating plates 8A, 8B and the frames 2, 3 in order to prevent the heat of the heating plates 8A, 8B from radiating to the frames 2, 3. .

  Patent Document 1 describes a heat insulating plate made of a laminate of a plurality of heat-resistant synthetic papers and a metal film as heat insulating materials 9A and 9B used for a resin molding die. However, since not only the heat from the heating plates 8A and 8B but also a large compressive force is applied to the heat insulating plate when the lower mold 5 is operated by driving the cylinder 6, the heat insulating plate deteriorates due to heat and compressive force. Therefore, replacement (maintenance) is necessary to maintain the performance. In order to improve the durability against compressive force, the density of the heat-resistant synthetic paper may be increased. However, in this case, the thermal conductivity is increased and the heat insulation performance is lowered, so that it cannot be adopted.

  As the heat insulating materials 9A and 9B, a vacuum heat insulating panel formed by evacuating the internal space 19 closed by a pair of metal plates 10 is known. Since this vacuum heat insulation panel has good heat insulation performance, it is not limited to heating furnaces and refrigerators, but is required to be used for a wide range of applications such as resin molds. However, this vacuum thermal insulation panel uses a metal plate 10 having a strength capable of withstanding a compressive force from the viewpoint of preventing heat transfer through the metal plate 10 and processing in addition to a space between the metal plates 10. I can't.

  Patent Document 2 describes a vacuum heat insulation panel in which a large number of spherical spacers having heat resistance are disposed between metal plates 10. This vacuum heat insulation panel can improve pressure resistance performance by a spherical spacer.

  However, the pressure resistance performance of this vacuum heat insulation panel is proportional to the number of spherical spacers, but when the number of spherical spacers is increased, the amount of heat transfer through the spherical spacers increases, so that the heat insulation performance decreases. Further, when a compressive force is applied to the metal plate 10, the arrangement position of the spherical spacer gradually curves into a spherical shape, so that the flatness cannot be maintained. In this case, heat transfer through the spherical spacer increases, so that the heat insulation performance decreases.

Japanese Patent Publication No. 7-85919 JP 2007-327549 A

  This invention makes it a subject to provide the vacuum heat insulation structure which can maintain heat | fever property reliably while suppressing the heat transfer through a spacer.

  In order to solve the above problems, the vacuum heat insulating structure of the present invention is a vacuum heat insulating structure formed by evacuating an internal space formed between first and second metal plates facing each other. Are disposed on opposite inner surfaces of the first and second reinforcing plates, and are disposed between the first and second reinforcing plates. The first and second reinforcing plates are disposed between the first and second reinforcing plates. A large number of hard spacers having smaller thermal conductivity than the metal plate and the first and second reinforcing plates are disposed between the first and second reinforcing plates. The thermal conductivity is smaller than that of the first and second metal plates, and the spacer is positioned at a predetermined position. And a positioning member having a positioning portion to be configured.

  Since this vacuum heat insulating structure is obtained by evacuating the internal space between the metal plates, the heat insulating performance is extremely good. In addition, since a large number of hard spacers having smaller thermal conductivity than the metal plates are disposed between the metal plates, they are not destroyed even when a high compressive force is applied. In addition, since a reinforcing plate that is harder than the metal plate is disposed between the metal plate and the spacer, the surface metal plate can be prevented from being plastically deformed. As a result, since the flatness of the metal plate can be maintained, it is possible to prevent the heat insulation performance from being lowered due to the deformation.

  In this vacuum heat insulating structure, the positioning member is preferably made of a fiber sheet that is thinner than the diameter of the spherical spacer. In this way, a large number of spherical spacers can be easily arranged at predetermined positions. In addition, since the positioning member can be disposed so as not to contact at least one of the reinforcing plates, heat transfer through the positioning member can be prevented.

  Moreover, it is preferable that the positioning part of the positioning member comprises a hole having a smaller diameter than the spherical spacer. In this way, a large number of spherical spacers can be arranged more easily and at predetermined positions. Moreover, when the positioning member is thinner than the spherical spacer, the positioning member can be disposed at a predetermined position between the reinforcing plates.

  Furthermore, the outer periphery of at least one of the first and second metal plates is inclined from the outer periphery of the first and second reinforcing plates to the joint located between the first and second reinforcing plates. It is preferable to provide an inclined portion extending in the direction. If it does in this way, it can prevent that an excessive intensity | strength (rigidity) part is formed in the outer peripheral part of a metal plate. Therefore, a load can be uniformly applied to the metal plate.

  In this case, it is preferable that the inclined portion has an inclination angle that does not contact the opposing metal plate in a state where the metal plate is bent by the vacuum exhaust. In this way, since the heat transfer distance from one metal plate to the other metal plate can be secured, the heat insulation performance can be improved.

  Moreover, it is preferable that the outer peripheral part which formed the inclination part of the said metal plate makes a non-contact state at least with respect to the said positioning member. In this way, heat transfer via the positioning member can be prevented.

  Further, the inclined portion has a first inclined surface portion located on the reinforcing plate side and a second inclined surface portion located on the joining portion side, and is formed by the second inclined surface portion and the joining portion. The angle is preferably larger than the angle formed by the first slope portion and the joint portion. If it does in this way, although distortion will arise in a vacuum heat insulation structure in manufacture, a spacer can be made to contact | abut uniformly and a flatness can be taken out by attaching to the heat insulation target object which has flatness. Moreover, rigidity can be ensured by the ridge formed at the boundary between the first slope and the second slope and the ridge formed at the boundary between the second slope and the joint. Therefore, even if the first inclined surface portion is curved by evacuation, it is possible to prevent contact with the facing surface.

  Furthermore, you may provide a reinforcement rib part in the said inclination part. In this way, since the rigidity of the inclined portion can be increased, it is possible to prevent the inclined portion from being bent and coming into contact with the opposing surface by evacuation.

  In the vacuum heat insulating structure of the present invention, the heat insulation performance can be improved because the internal space between the metal plates is evacuated. In addition, since a large number of hard spacers having a smaller thermal conductivity than the metal plates are arranged between the metal plates, the whole is not destroyed even when a high compressive force is applied. In addition, since a reinforcing plate that is harder than the metal plate is disposed between the metal plate and the spacer, the surface metal plate can be prevented from being plastically deformed. As a result, since the flatness of the metal plate can be maintained, it is possible to prevent the heat insulation performance from being lowered.

It is a perspective view which shows the vacuum heat insulation panel which is the vacuum heat insulation structure of 1st Embodiment. (A), (B) is principal part sectional drawing of FIG. It is a disassembled perspective view of a vacuum heat insulation panel. It is a perspective view which shows the 1st step of the manufacturing process of a vacuum heat insulation panel. It is a perspective view which shows the 2nd step of the manufacturing process of a vacuum heat insulation panel. It is a perspective view which shows the 3rd step of the manufacturing process of a vacuum heat insulation panel. It is sectional drawing which shows the 1st step of the manufacturing process of a vacuum heat insulation panel. It is sectional drawing which shows the 2nd step of the manufacturing process of a vacuum heat insulation panel. It is sectional drawing which shows the 3rd step of the manufacturing process of a vacuum heat insulation panel. It is sectional drawing which shows the vacuum heat insulation panel of 2nd Embodiment. It is sectional drawing which shows the vacuum heat insulation panel of 3rd Embodiment. It is sectional drawing which shows the vacuum heat insulation panel of 4th Embodiment. It is sectional drawing which shows the vacuum heat insulation panel of 5th Embodiment. It is a principal part disassembled perspective view which shows the metal plate of the vacuum heat insulation panel of 6th Embodiment. It is principal part sectional drawing of the vacuum heat insulation panel of 6th Embodiment. It is a principal part disassembled perspective view which shows the metal plate of the vacuum heat insulation panel of 7th Embodiment. It is principal part sectional drawing of the vacuum heat insulation panel of 7th Embodiment. It is a chart which shows an experimental result. It is the schematic which shows the usage example of a vacuum heat insulation panel.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 5 show a vacuum heat insulation panel which is a vacuum heat insulation structure according to the first embodiment of the present invention. As shown in FIGS. 1, 2 (A), (B) and FIG. 3, the vacuum heat insulation panel includes reinforcing plates 21 </ b> A and 21 </ b> B in an internal space 19 formed in a pair of metal plates 10 </ b> A and 10 </ b> B, A large number of spacers 23, positioning members 24, and metal foils 27A and 27B are arranged. A getter (not shown) for absorbing a gas generated in the internal space 19 after evacuation and maintaining a desired degree of vacuum is disposed at a predetermined position inside the metal plates 10A and 10B. .

  The first and second metal plates 10A and 10B are made of thin-walled (about 0.5 mm) stainless steel (SUS304) having low thermal conductivity and excellent workability. These metal plates 10A and 10B have rectangular arrangement portions 11A and 11B, respectively, and the outer peripheral portions thereof are bent inclined portions 14A and 14B, and flanges are formed from the edges of the inclined portions 14A and 14B. Joints 17A and 17B that are bent outward are formed.

  The arrangement portions 11A and 11B are planar and are arranged in a state where one of them is brought into contact with the object to be insulated. The mounting portions 11A and 11B are provided with mounting recesses 12 that are recessed in a substantially inverted truncated cone shape at predetermined positions. The mounting recess 12 has inclined portions 13A, 13B similar to the inclined portions 14A, 14B at the outer periphery. In addition, the mounting recess 12 is provided with a mounting hole 12a so as to form a concentric circle after joining the joints 17A and 17B, and the periphery to the inclined parts 13A and 13B is joined by TIG welding or the like after formation. In addition, arrangement | positioning part 11A, 11B is formed larger than reinforcement board 21A, 21B so that an outer peripheral part may be located in the outer side of reinforcement board 21A, 21B.

  The inclined portions 14A and 14B include a first inclined surface portion 15 bent in a direction (reinforcing plates 21A and 21B) from the outer peripheral portion of the arrangement portions 11A and 11B to the inner surface side, and an outer side of the first inclined surface portion 15. The second inclined surface portion 16 is further bent inward from the end. Similarly, the inclined portions 13A and 13B are further inward from the first inclined surface portion 15 bent to the inner surface side from the formation position of the mounting recess 12 of the arrangement portions 11A and 11B, and from the inner end of the first inclined surface portion 15. The second inclined surface portion 16 is bent to the right. The 2nd slope part 16 of this embodiment is comprised by the curved surface curved inward. In the inclined portions 14A and 14B configured as described above, the angle β formed between the tangential plane of the second inclined surface portion 16 and the joint portions 17A and 17B is greater than the angle α formed between the first inclined surface portion 15 and the joint portions 17A and 17B. large. Similarly, in the inclined portions 13 </ b> A and 13 </ b> B, the angle β formed between the tangential plane of the second slope portion 16 and the bottom surface of the mounting recess 12 is larger than the angle α formed between the first slope portion 15 and the bottom surface of the mounting recess 12. In other words, the second inclined surface portion 16 is bent at an obtuse angle with respect to the bottom surfaces of the joint portions 17A and 17B or the mounting recess 12, and the extending direction is close to the direction in which the compressive force is applied. Therefore, the second inclined surface portion 16 serves as a bent portion that increases rigidity. In addition, these slope portions 15 and 16 are configured to have inclination angles (α, β) that do not come into contact with each other even when the first slope portions 15 and 15 having a planar shape are bent by vacuum evacuation.

  The joint portions 17A and 17B are positioned so as to overlap each other, and are joined by pressure bonding such as seam welding, butt welding such as TIG welding, MIG brazing, or the like. These joint portions 17A and 17B are located between the pair of reinforcing plates 21A and 21B in the assembled state. Positioning holes 18 are provided at the four corners of the joints 17A and 17B for positioning when mounted on the object to be insulated.

  The metal plates 10A and 10B configured as described above have a predetermined interval (about approximately) between the arrangement portions 11A and 11B by the inclined portions 14A and 14B and 13A and 13B in a state where the joint portions 17A and 17B are joined. 6 mm) of internal space 19 is formed. Further, as shown in FIG. 3, the first metal plate 10A before joining is extended so that one side joining portion 17A-1 protrudes outward, and the extending portion has a cylindrical shape. A protruding exhaust part 20 is formed. The exhaust part 20 may be simply opened so as to communicate with the internal space 19, or a tip tube may be joined. Similarly, a joint portion 17B-1 on one side extends from the second metal plate 10B so as to close the lower surface of the exhaust portion 20. These joint portions 17A-1 and 17B-1 are cut after the internal space 19 is evacuated from the exhaust portion 20 and the inside of the exhaust portion 20 is joined.

  The reinforcing plates 21A and 21B are arranged on the inner surfaces of the arrangement portions 11A and 11B of the first and second metal plates 10A and 10B via metal foils 27A and 27B. These reinforcing plates 21A and 21B have a flat rectangular shape smaller than the placement portions 11A and 11B, and are provided with insertion holes 22 having a diameter larger than that of the mounting recesses 12 at positions corresponding to the mounting recesses 12. The reinforcing plates 21A and 21B of the present embodiment are made of stainless steel (SUS301 or SUS630) having a higher hardness (Vickers hardness) than the first and second metal plates 10A and 10B. Here, in the present embodiment, SUS304 constituting the metal plates 10A and 10B has a Vickers hardness of about 200 HV, and SUS301 or SUS630 constituting the reinforcing plates 21A and 21B has a Vickers hardness of about 500 HV. However, the reinforcing plates 21A and 21B have higher thermal conductivity than the metal plates 10A and 10B. The thickness of the reinforcing plates 21A and 21B is set (about 0.5 mm) by the number of spacers 23 and the compression force applied after manufacture.

The spacer 23 has a spherical shape disposed between the first and second reinforcing plates 21A and 21B. The spacer 23 is formed of zirconia (Zro ₂ ), which is a kind of hard (Vickers hardness 1150 to 1200 HV) ceramic having lower thermal conductivity and higher heat resistance than the metal plates 10A and 10B. The spacers 23 of the present embodiment are arranged at predetermined intervals in the vertical and horizontal directions so as to form a matrix between the reinforcing plates 21A and 21B. The diameter of the spacer 23 is the same as the interval of the internal space 19 and the thickness of the reinforcing plates 21A and 21B. It is formed with a subtracted dimension (about 5 mm). The spacer 23 is not limited to a ceramic ball, and may be made of silica (SiO ₂ ) or a heat resistant resin, and any may be used as long as it has a low thermal conductivity and is hard. The number of spacers 23 is set according to its own pressure resistance and compressive force (required pressure strength) applied after manufacture.

  The positioning member 24 is for positioning the spacer 23 at a predetermined position and disposing it between the reinforcing plates 21A and 21B. The positioning member 24 is made of a soft fiber sheet having a lower thermal conductivity than the first and second metal plates 10A and 10B and having flexibility. The positioning member 24 of the present embodiment is made of short glass fiber or ceramic fiber, has a rectangular shape with the same area as the placement portions 11A and 11B, and has a thickness (3 mm) thinner than the diameter of the spacer 23. Further, the positioning member 24 is formed with an insertion hole 25 having a diameter larger than that of the mounting recess 12 at a position corresponding to the mounting recess 12, similarly to the reinforcing plates 21 </ b> A and 21 </ b> B. Thereby, the positioning member 24 is comprised so that it may not contact the attachment recessed part 12 and inclination part 14A, 14B of metal plate 10A, 10B in an assembly | attachment state. Further, the positioning member 24 is provided with a positioning portion 26 including a through hole having a smaller diameter (about 4 mm) than the spacer 23 at a position where the spacer 23 is disposed. Thereby, the positioning member 24 is comprised so that it can arrange | position in the state which maintained the non-contact state with respect to both or one of reinforcement board 21A, 21B. When the positioning member 24 is brought into contact with one of the reinforcing plates 21A and 21B, the arrangement portions 11A and 11B of the metal plates 10A and 10B on the contact side are preferably positioned on the low temperature side by heat insulation.

  The metal foils 27A and 27B are arranged between the metal plates 10A and 10B and the reinforcing plates 21A and 21B, respectively, to prevent radiant heat transfer. The metal foils 27A and 27B are made of copper or aluminum, are formed in a rectangular shape having the same area as the arrangement portions 11A and 11B of the metal plates 10A and 10B, and an insertion hole 28 is formed at a corresponding position of the mounting recess 12. ing.

  Next, the manufacturing method of the vacuum heat insulation panel which consists of these structural members is demonstrated with reference to FIG. 4 and FIG. In addition, FIG. 4 means the state where the part which attached the light ink is joined.

  As shown in FIG. 3, the mounting recess 12 is formed in the metal plates 10A and 10B before assembly, but the mounting hole 12a and the positioning hole 18 are not provided. Further, as described above, the joint portions 17A-1 and 17B-1 on one side are in an extended state.

  In this state, for example, after the metal foil 27B is disposed on the inner surface side of the second metal plate 10B, the second reinforcing plate 21B is disposed on the upper side. Next, a positioning member 24 provided with a spacer 23 is disposed above the reinforcing plate 21B. At this time, the spacer 23 is arranged in advance so that the center thereof is positioned at the center of the thickness of the positioning member 24 and a part thereof protrudes from both surfaces of the positioning member 24. Next, after arranging the first reinforcing plate 21A on the upper side of the spacer 23, the metal foil 27A is arranged on the upper side. Finally, the first metal plate 10A is arranged so as to cover the upper side. Needless to say, each member may be disposed on the first metal plate 10A.

  When the respective members are accommodated in the first and second metal plates 10A and 10B in this way, the superimposed joining portions 17A and 17B are joined as shown in FIGS. 4A and 5A. At this time, the joining portions 17A-1 and 17B-1 are joined except for a region from the exhaust portion 20 to the inclined portions 14A and 14B.

  Next, as shown in FIGS. 4B and 5B, mounting holes 12a are provided in the mounting recess 12 by pressing or the like, and positioning holes 18 are provided at the four corners of the joints 17A and 17B. Thereafter, the remaining portions up to the inclined portions 13A and 13B of the mounting recess 12 positioned around the mounting hole 12a are joined to each other.

  In this state, a well-known exhaust device is connected to the exhaust unit 20 to perform vacuum exhaust until the internal space 19 reaches a predetermined degree of vacuum. In addition, since this vacuum exhaust does not join the predetermined area | region from the exhaust part 20 to inclination part 14A, 14B, it can exhaust sufficiently from the clearance gap.

  Then, when the internal space 19 is evacuated to a predetermined degree of vacuum, as shown in FIG. 4C and FIG. 5C, the non-joint region between the exhaust part 20 and the inclined parts 14A and 14B is joined to seal the internal space 19. Thereafter, the extended portions (unnecessary portions) of the joint portions 17A-1 and 17B-1 including the exhaust portion 20 are cut.

  Thus, since the vacuum heat insulation panel of this invention is what evacuated the internal space 19 between metal plate 10A, 10B, heat insulation performance is very favorable. And since metal foil 27A, 27B which prevents radiant heat transfer is arrange | positioned between metal plate 10A, 10B and reinforcement board 21A, 21B, respectively, heat insulation performance can be improved.

  In addition, between the metal plates 10A and 10B, a large number of hard spacers 23 having smaller thermal conductivity than the metal plates 10A and 10B are disposed, so that they are not destroyed even when a high compression force is applied. Sufficient pressure strength can be secured. Moreover, since the reinforcing plates 21A and 21B harder than the metal plates 10A and 10B are disposed between the metal plates 10A and 10B and the spacer 23, the metal plates 10A and 10B on the surface have the shape of the spacer 23. It can prevent plastic deformation along. As a result, the spacer 23 is maintained in a point contact state, and the metal plates 10A and 10B can also maintain flatness. Therefore, it is possible to prevent the heat insulation performance from being lowered due to the deformation, and to prevent the load applied from being biased.

  Furthermore, since the spacer 23 of this embodiment is arrange | positioned in the predetermined position by the positioning member 24, assembly workability | operativity can be improved. Since the positioning member 24 is made of a fiber sheet that is thinner than the diameter of the spacer 23, the positioning member 24 can be disposed so as not to contact at least one of the reinforcing plates 21A and 21B. Heat can be prevented. In addition, since the positioning portion 26 of the positioning member 24 is formed of a hole having a smaller diameter than the spherical spacer 23, the spacer 23 can be easily and reliably disposed at a predetermined position, and the positioning member 24 is disposed between the reinforcing plates 21A and 21B. It can also be placed in position.

  Furthermore, inclined portions 14A and 14B that extend obliquely from the outer periphery of the reinforcing plates 21A and 21B to the joints 17A and 17B are provided on the outer periphery of the metal plates 10A and 10B. In addition, inclined portions 13A and 13B are also provided on the outer peripheral portion of the mounting recess 12 formed in the placement portions 11A and 11B and recessed inward. Therefore, it is possible to prevent excessive strength (rigidity) portions from being formed in the outer peripheral portions of the metal plates 10A and 10B and the arrangement portions 11A and 11B. Therefore, a load can be uniformly applied to the metal plates 10A and 10B. Further, the inclined portions 14A and 14B can secure a heat transfer distance from the metal plates 10A and 10B located on the side of the heat insulation object to the metal plates 10B and 10A located on the opposite side. Therefore, the heat insulation performance can be improved.

  Since the inclined portions 14A and 14B are formed at an inclination angle that does not contact each other even if they are bent by vacuum evacuation, a heat transfer distance from one metal plate 10A or 10B to the other metal plate 10B or 10A can be secured. Insulation performance can be improved. Further, since the positioning member 24 is not in contact with the inclined portions 14A and 14B, heat transfer via the positioning member 24 can be prevented.

  Moreover, the inclined portions 14A, 14B and 13A, 13B are formed such that the angle β formed by the second inclined surface portion 16 and the joint portions 17A, 17B is larger than the angle α formed by the first inclined surface portion 15 and the joint portions 17A, 17B. is doing. Therefore, it is possible to reliably make the arrangement portions 11 </ b> A and 11 </ b> B come into surface contact with the object to be insulated at the first slope portion 15. Incidentally, it is unavoidable that the vacuum heat insulation panel is distorted in manufacturing. However, the vacuum heat insulation panel of this embodiment can make the spacer 23 contact | abut uniformly and can give flatness by attaching to the heat insulation target object which has flatness. Also, rigidity is secured by the ridge formed at the boundary between the first slope 15 and the second slope 16 and the ridge formed at the boundary between the second slope 16 and the joints 17A and 17B. it can. Therefore, even if the first inclined surface portion 15 is curved by evacuation, it is possible to reliably prevent contact with the facing surface.

  FIG. 6 shows a vacuum heat insulation panel of the second embodiment. The second embodiment is different from the first embodiment in that the first and second metal plates 10A and 10B are provided with one inclined portion 14A and 14B having a flat surface. Although not shown, the same applies to the inclined portions 13A and 13B of the mounting recess 12 formed in the placement portions 11A and 11B. The vacuum heat insulation panel of this 2nd Embodiment is manufactured similarly to 1st Embodiment. In addition, substantially the same operations and effects as in the first embodiment can be obtained.

  FIG. 7 shows a vacuum heat insulation panel of the third embodiment. In the third embodiment, the first and second metal plates 10A and 10B are provided with inclined portions 14A and 14B and 13A and 13B having a flat surface as in the second embodiment. 14B and 13A, 13B are different from the second embodiment in that reinforcing rib portions 29 that are recessed inward so as to form a substantially oval shape are provided. Since the vacuum heat insulation panel of this 3rd Embodiment can improve the rigidity of inclination part 14A, 14B, it can prevent that inclination part 14A, 14B curves and contacts mutually by vacuum exhaust. And the effect | action and effect similar to 1st Embodiment can be acquired.

  FIG. 8 shows a vacuum heat insulation panel of the fourth embodiment. In the fourth embodiment, an outer wall portion 14A ′ extending along a direction in which a compressive force is applied instead of the inclined portions 14A and 14B between the arrangement portions 11A and 11B of the metal plates 10A and 10B and the joint portions 17A and 17B. , 14B ′ is greatly different from each embodiment. Although not shown, the same applies to the inclined portions 13A and 13B of the mounting recess 12 formed in the placement portions 11A and 11B. The vacuum heat insulation panel of this 4th embodiment is manufactured like each embodiment. In addition, substantially the same operations and effects as those of the embodiments can be obtained.

  FIG. 9 shows a vacuum heat insulation panel of the fifth embodiment. The fifth embodiment is different from the first embodiment in that separate mounting plate members 30A and 30B are disposed on the same vacuum insulation panel arrangement portions 11A and 11B as those in the first embodiment. In addition, in this 5th Embodiment, although the vacuum heat insulation panel of 1st Embodiment is used, you may use the vacuum heat insulation panel in any one of 2nd Embodiment thru | or 4th Embodiment.

  The mounting plate members 30A and 30B are made of stainless steel (SUS304) having a relatively low thermal conductivity. These mounting plate materials 30A and 30B have the same rectangular shape as the outer peripheral shape of the joint portions 17A and 17B of the metal plates 10A and 10B, and the thickness thereof is difficult to deform (about 5 to 10 mm). Yes. These mounting plate members 30A and 30B are provided with a similar mounting hole 31 at a position corresponding to the mounting hole 12a, and a similar positioning hole 18 (not shown) at a position corresponding to the positioning hole 18. And it is set as the structure which attaches to a predetermined | prescribed heat insulation object through the attachment holes 12a and 31, while integrating by arrange | positioning an attachment jig to the positioning hole 18 which corresponds up and down.

  In the fifth embodiment configured as described above, the mounting plate materials 30A and 30B having low thermal conductivity are arranged in the arrangement portions 11A and 11B, so that the heat transfer efficiency through the metal material is increased. However, in a state where it is attached to the object to be insulated, the one that becomes the high temperature side (for example, the side of the metal plate 10A) and the other that becomes the low temperature side (for example, the side of the metal plate 10B) are only the thin joints 17A and 17B. Consecutive state. For this reason, the heat transfer efficiency from one to the other is hardly different from each embodiment. Therefore, the heat insulation efficiency can be improved by the amount of the mounting plate materials 30A and 30B having low heat transfer efficiency. Moreover, the design for disposing the object in a surface contact state with respect to the heat insulating object is extremely good, and even if the metal plates 10A and 10B are distorted during manufacturing, the metal plate is sandwiched between the mounting plate materials 30A and 30B. The planarity of the arrangement portions 11A and 11B of 10A and 10B can be improved.

  10 and 11 show a vacuum heat insulation panel of the sixth embodiment. In the sixth embodiment, support protrusions 33 and support portions 34 are provided in the joint portions 17A-1 and 17B-1 of the metal plates 10A and 10B, and an exhaust passage for improving exhaust efficiency is formed. It is different from each embodiment. In addition, in this 6th Embodiment, although the vacuum heat insulation panel of 1st Embodiment is used, you may use the vacuum heat insulation panel in any one of 2nd Embodiment thru | or 5th Embodiment.

  Specifically, the exhaust part 20 similar to each embodiment is provided in the joint part 17A-1 of the first metal plate 10A. And around this exhaust part 20, the support protrusion 33 which contact | abuts to the junction part 17B-1 of the 2nd metal plate 10B which opposes is provided. The support protrusions 33 are recessed inward so as to form a circular shape in plan view, and five support protrusions 33 are provided between the exhaust part 20 and the inclined part 14 </ b> A and on both sides of the exhaust part 20. Yes. Further, a support portion 34 that contacts and supports the exhaust portion 20 is provided at the joint portion 17B-1 of the second metal plate 20B. The support portion 34 extends in an elliptical shape in plan view from the tip edge of the joint portion 17B-1 toward the inclined portion 14B. Further, the support portion 34 is configured such that the overall length is wider than the diameter of the exhaust portion 20 and the width is narrower than the diameter of the exhaust portion 20.

  The sixth embodiment configured as described above is manufactured in the same manner as each embodiment. And in this 6th Embodiment, since the support protrusion 33 and the support part 34 are formed, the exhaust efficiency at the time of vacuum exhaust can be improved. In addition, after evacuation, it will be in the completion state similar to each embodiment by joining a non-joining area | region and cut | disconnecting joining part 17A-1, 17B-1. And the vacuum heat insulation panel of this completion state can acquire the effect | action and effect similar to each embodiment.

  In the sixth embodiment, the pair of support protrusions 33 are provided on both sides of the exhaust part 20, but the support protrusions 33 having a continuous oval shape in plan view may be provided.

  12 and 13 show a vacuum heat insulation panel of the seventh embodiment. In the seventh embodiment, the exhaust portion 20 is provided so as to be recessed inward, and the support portion 34 is not provided in the joint portion 17B-1 of the second metal plate 10B. There is a big difference. The seventh embodiment configured as described above can obtain the same operations and effects as the sixth embodiment.

  In addition, in order to confirm the effect by the structure of this invention, the inventors are the case where the vacuum heat insulation panel of this invention is arrange | positioned between the frames 2 and 3 and the heating plates 8A and 8B of a rubber molding die. The amount of heat release (kw) was calculated. The result is shown in FIG. The comparative example is a conventional heat insulating material made of a heat resistant resin. The first example is the vacuum heat insulation panel of the fourth embodiment shown in FIG. The second example is a vacuum heat insulation panel of the fifth embodiment shown in FIG. In the third example, the thickness of the metal plates 10A and 10B of the fifth embodiment shown in FIG. 9 is reduced to 0.3 mm, and the thickness of the mounting plate materials 30A and 30B is increased accordingly.

  As shown in this table, the heat dissipation amount (w) around the panel decreases in the order of the comparative example, the first example, the second example, and the third example. The heat transfer distance (m) is 20 mm in the comparative example, 7 mm in the first example, and 27 mm in the second and third examples. These thermal conductivities (Kcal / m · hr · ° C.) are determined by the material for forming the heat insulating material. The comparative example is 0.3, while each example is 14. The temperature on the high temperature side (heating plates 8A and 8B side) is 180 ° C., and the temperature on the low temperature side (frames 2 and 3 side) is 30 ° C. Moreover, since each Example has the attachment hole 12a for attachment, the heat radiation amount (w) from the part becomes low in order of 1st Example, 2nd Example, and 3rd Example. Furthermore, the spacer 23 has a thermal conductivity (Kcal / m · hr · ° C.) of 3.01 and a heat release amount (w) of 72.2. On the other hand, the heat radiation amount (w) due to the radiation of the heating plates 8A and 8B is 41.6. As a result, the heat release amount (kw) by operating for 9 hours is 5.9 in the comparative example, 5.4 in the first example, 1.9 in the second example, and 1 in the third example. .4. Therefore, the total heat radiation (kw) from above and below is 11.8 in the comparative example, 10.8 in the first example, 3.8 in the second example, and 2.8 in the third example. is there. From this result, it can be seen that the vacuum heat insulation panel of the embodiment according to the present invention has higher heat insulation performance than the conventional product. In addition, the present embodiment can obtain a specific effect that the pressure strength can be set as desired by the spacers 23 and the reinforcing plates 21A and 21B disposed inside.

  In addition, the vacuum heat insulation structure of this invention is not limited to the structure of the said embodiment, A various change is possible.

  For example, in the first embodiment, the second inclined surface portion 16 of the inclined portions 14A and 14B is configured by a curved surface, but may be configured to extend in a planar shape. Moreover, in each embodiment, although inclined part 14A, 14B formed in metal plate 10A, 10B was provided so that a symmetrical shape might be made, it is good also as an asymmetrical shape. Further, in each embodiment, the positioning member 24 is thinner than the diameter of the spacer 23. However, a thicker member may be adopted and disposed in pressure contact between the reinforcing plates 21A and 21B. Of course, the positioning portion 26 for positioning the spacer 23 may be larger than the diameter of the spacer 23. In addition, the spacer 23 is configured to be in point contact with both of the reinforcing plates 21A and 21B by being spherical, but for example, by being triangular in shape, the spacer 23 is configured to be in point contact with only one of the reinforcing plates 21A and 21B. It is good. Furthermore, the positioning portion 26 of the positioning member 24 is not limited to a through-hole, and may be a hole with one end closed.

  And the vacuum heat insulation panel of this embodiment can be used not only for a rubber molded product and a resin molding die but for various uses. In addition, the configuration of the present invention in which the spacer 23 and the reinforcing plates 21A and 21B are disposed is not limited to a flat vacuum heat insulating panel, and can be similarly applied to a vacuum heat insulating structure having a predetermined shape.

DESCRIPTION OF SYMBOLS 10A, 10B ... Metal plate 11A, 11B ... Arrangement | positioning part 14A, 14B ... Inclination part 15 ... 1st slope part 16 ... 2nd slope part 17A, 17B ... Joint part 19 ... Inner space 21A, 21B ... Reinforcement plate 23 ... Spacer 24 ... Positioning member 26 ... Positioning part 27A, 27B ... Metal foil 29 ... Reinforcing rib part

Claims (8)

In the vacuum heat insulating structure formed by evacuating the internal space formed between the first and second metal plates facing each other,
A first reinforcing plate and a second reinforcing plate which are disposed on opposite inner surface sides of the first and second metal plates, respectively, and are harder than the first and second metal plates;
A plurality of spacers disposed between the first and second reinforcing plates and having a lower thermal conductivity than the first and second metal plates,
A positioning member disposed between the first and second reinforcing plates, having a thermal conductivity smaller than that of the first and second metal plates, and having a positioning portion for positioning the spacer at a predetermined position;
A vacuum heat insulating structure characterized by comprising:   The vacuum heat insulating structure according to claim 1, wherein the positioning member is made of a fiber sheet that is thinner than a diameter of the spacer having a spherical shape.   The vacuum heat insulating structure according to claim 1, wherein the positioning portion of the positioning member includes a hole having a smaller diameter than the spherical spacer.   At least one outer peripheral portion of the first and second metal plates is inclined and extended from an outer peripheral portion outer side of the first and second reinforcing plates to a joint portion located between the first and second reinforcing plates. The vacuum heat insulating structure according to any one of claims 1 to 3, wherein an inclined portion is provided.   5. The vacuum heat insulating structure according to claim 4, wherein the inclined portion has an inclination angle that does not contact an opposing metal plate in a state where the metal plate is bent by evacuation.   6. The vacuum heat insulating structure according to claim 4, wherein an outer peripheral portion in which the inclined portion of the metal plate is formed is in a non-contact state with respect to at least the positioning member.   The inclined portion has a first slope portion located on the reinforcing plate side and a second slope portion located on the joint portion side, and an angle formed by the second slope portion and the joint portion is The vacuum heat insulating structure according to any one of claims 5 to 6, wherein the vacuum heat insulating structure is larger than an angle formed by the first inclined surface portion and the joint portion.   The vacuum heat insulating structure according to any one of claims 5 to 7, wherein a reinforcing rib portion is provided on the inclined portion.